Kohler — Thermostat Testing
Testing & diagnosis
From a Kohler service manual covering: LH630, LH685, LH750, LH760. Check it applies to your exact model before use.
Browse Kohler generators & specs →
Procedure
- Remove thermostat from system.
- Suspend thermostat by frame in container of water; do not touch bottom.
- Heat water and measure temperature.
- Valve should begin to open at 79.4°C (175°F).
- Valve can be completely open at 90.5°C (195°F).
- Replace thermostat if opening is more than 10° below or fails 10-15 degrees above specified opening.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Begins open 79.4°C (175°F)
- Fully open 90.5°C (195°F)
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.